(1) Larry Silverstein is not the sole owner of the WTC. He is merely the CEO of an enormous consortium of investors.
(2) So far the WTC has been an enormous LOSS to this consortium because its lease requires it to make very large payments to the Port Authority (the actual owner) - even though the consortium has been unable to collect a penny in rent since Sept 11th.
(3) If any of those nasty rumors trying to connect Silverstein with the attack were true, you'd think they'd be advanced during the very pricey lawsuits that the consortium has had to bring. First there was an enormous lawsuit against, primarily, the Lloyds of London insurance consortium, which had tried to argue that it could pay off only for one mishap for the entire loss of the whole WTC, on the pretext that the collisions into two towers were part of only one conspiracy and therefore only a single mishap. You'd think if Silverstein knew what was going to happen, he'd have had the insurance policy written a lot more clearly on that issue. Now his consortium is suing airlines for millions - if there were anything to those nasty rumors, you can be sure the airlines will mention them rather than have to pay millions of dollars.
Once the structures were destroyed, the rent became a moot point; (you can't collect rent on a structure that no longer exists) you need to read and understand contract law. Towers 1 and 2 were paid for by the insurers as 2 separate incidents. Silverstein is sitting on more than $2 billion in cash payouts thus far. He is now hoping for another 2.8 billion, and he will get it. Additionally, he and his daughter were missing from the tower where they normally worked on 9-11, maybe that was a coincidence, but I doubt it. I wonder who is paying you to spew this drivel, because it doesn't pass the smell test.
It took prolonged litigation to make the insurers pay for the two separate incidents. And it's you who needs to read contract law; the consortium headed by Silverstein was contractually required to pay the Port Authority a fixed annual rental on the WTC ... regardless of how much rent Silverstein was collecting from tenants. Silverstein had a small office at the WTC but his regular real estate & law office was in midtown. Considering that the first plane hit at 8:46 AM, on a primary election day, a LOT of people were not yet inside the towers.
Even in the multi-million dollar insurance litigation, the defense did not attempt to suggest that Silverstein had any complicity with the attack or the collapse of the towers.